Azure SQL DW Performance: CTAS/Partition Switching VS UPDATE/DELETE

DML operations can be resource intensive and harmful to CCI indexes in Azure SQL Data Warehouse. The main performance benefit comes from UPDATE & DELETE operations being fully logged and CTAS is minimally logged. There is also advantages to recreating the CCI index VS modifying it with a DML statement. The preferred method is to…


Azure SQL Data Warehouse SQL Operations Studio Extension Available

In may the engineering team for Azure SQL Data Warehouse announced integration with SQL Operations Studio. Now they have released a preview of an extension that contains pre built dashboards to monitor you Data Warehouse instances! Today you can monitor data skew, ColumnStore index health, and system resource usage. We expect more scenarios to be…


SET IMPLICIT_TRANSACTIONS Behavior On Azure SQL Data Warehouse and APS

Working with transactions in Azure SQL Data Warehouse (ADW) and the Analytics Platform System (APS, aka PDW) is a bit different than one would expect. Though most of us tend to operate under the default behavior with IMPLICIT_TRANSACTIONS OFF, developers that interact with ADW/APS using other languages may find transaction handling using their language constructs…


Performance: Evaluate Data Skew

This topic applies to both Azure SQL Data Warehouse and Analytic Platform System Data skew occurs when one distribution has more data than others.  When data is inserted into a distributed table, each row will be assigned and sent to a distribution for storage.  The distribution a row is sent to is decided by applying…


How To: Move your Azure Data Warehouse to a new region and/or subscription

This post applies to Azure SQL Data Warehouse The functionality currently does not exist to move your Azure SQL Data Warehouse instance to a subscription other than the one it was created under.  What you can do is move the server that contains the instance to another subscription or resource group.  Moving a server will…